Multi-target Microsoft.NET.HostModel (#114343)

* Multi-target Microsoft.NET.HostModel

Multi-targeting helps to use latest on .NETCoreApp and LKG (toolset)
on .NETFramework. Should partially unblock m-p packages dependency flow in dotnet/sdk:
dotnet/sdk#48034

---------

Co-authored-by: Carlos Sánchez López <1175054+carlossanlop@users.noreply.github.com>

Author: ViktorHofer

eng/Versions.props

@@ -143,7 +143,6 @@
     <SystemCollectionsImmutableToolsetVersion>8.0.0</SystemCollectionsImmutableToolsetVersion>
     <SystemMemoryToolsetVersion>4.5.5</SystemMemoryToolsetVersion>
     <SystemTextJsonToolsetVersion>8.0.5</SystemTextJsonToolsetVersion>
-    <SystemReflectionMetadataToolsetVersion>8.0.0</SystemReflectionMetadataToolsetVersion>
     <SystemReflectionMetadataLoadContextToolsetVersion>8.0.0</SystemReflectionMetadataLoadContextToolsetVersion>
     <SystemReflectionMetadataToolsetVersion>8.0.0</SystemReflectionMetadataToolsetVersion>
     <SystemTextEncodingsWebToolsetVersion>8.0.0</SystemTextEncodingsWebToolsetVersion>

src/installer/managed/Microsoft.NET.HostModel/ComHost/ConflictingGuidException.cs

@@ -14,6 +14,10 @@ public class ConflictingGuidException : Exception
     {
         public ConflictingGuidException(string typeName1, string typeName2, Guid guid)
         {
+#if NET
+            ArgumentNullException.ThrowIfNull(typeName1);
+            ArgumentNullException.ThrowIfNull(typeName2);
+#else
             if (typeName1 is null)
             {
                 throw new ArgumentNullException(nameof(typeName1));
@@ -22,6 +26,7 @@ public ConflictingGuidException(string typeName1, string typeName2, Guid guid)
             {
                 throw new ArgumentNullException(nameof(typeName2));
             }
+#endif
             TypeName1 = typeName1;
             TypeName2 = typeName2;
             Guid = guid;

src/installer/managed/Microsoft.NET.HostModel/ComHost/MissingGuidException.cs

@@ -14,10 +14,14 @@ public class MissingGuidException : Exception
     {
         public MissingGuidException(string typeName)
         {
+#if NET
+            ArgumentNullException.ThrowIfNull(typeName);
+#else
             if (typeName is null)
             {
                 throw new ArgumentNullException(nameof(typeName));
             }
+#endif
             TypeName = typeName;
         }
 

src/installer/managed/Microsoft.NET.HostModel/Microsoft.NET.HostModel.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>netstandard2.0</TargetFramework>
+    <TargetFrameworks>$(NetCoreAppToolCurrent);$(NetFrameworkToolCurrent)</TargetFrameworks>
     <Description>Abstractions for modifying .NET host binaries</Description>
     <IsShipping>false</IsShipping>
     <IsPackable Condition="'$(BuildOnlyPgoInstrumentedAssets)' != 'true'">true</IsPackable>
@@ -14,16 +14,16 @@
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <!-- Historically, the key for the managed projects is the AspNetCore key Arcade carries. -->
     <StrongNameKeyId>MicrosoftAspNetCore</StrongNameKeyId>
-    <PublicSign Condition=" '$(OS)' != 'Windows_NT' ">true</PublicSign>
+    <PublicSign Condition="'$(OS)' != 'Windows_NT'">true</PublicSign>
     <DefineConstants>$(DefineConstants);HOST_MODEL</DefineConstants>
   </PropertyGroup>
 
-  <ItemGroup>
-    <!-- SDK pins this to a lower version https://github.com/dotnet/sdk/issues/43325 -->
-    <PackageReference Include="System.Reflection.Metadata" Version="$(SystemReflectionMetadataToolsetVersion)" />
-    <PackageReference Include="System.Memory" Version="$(SystemMemoryVersion)" />
-
-    <ProjectReference Include="$(LibrariesProjectRoot)System.Text.Json\src\System.Text.Json.csproj" />
+  <!-- Manually reference these assemblies which are provided by MSBuild / .NET SDK -->
+  <ItemGroup Condition="'$(TargetFrameworkIdentifier)' == '.NETFramework'">
+    <PackageDownloadAndReference Include="System.Collections.Immutable" Version="$(SystemCollectionsImmutableToolsetVersion)" Folder="lib/net462" />
+    <PackageDownloadAndReference Include="System.Memory" Version="$(SystemMemoryToolsetVersion)" Folder="lib/net461" />
+    <PackageDownloadAndReference Include="System.Text.Json" Version="$(SystemTextJsonToolsetVersion)" Folder="lib/net462" />
+    <PackageDownloadAndReference Include="System.Reflection.Metadata" Version="$(SystemReflectionMetadataToolsetVersion)" Folder="lib/net462" />
   </ItemGroup>
 
   <ItemGroup>
@@ -35,4 +35,6 @@
     <Compile Include="$(CoreClrProjectRoot)tools\Common\System\Collections\Generic\ArrayBuilder.cs" Link="Common\ArrayBuilder.cs" />
   </ItemGroup>
 
+  <Import Project="$(RepositoryEngineeringDir)PackageDownloadAndReference.targets" />
+
 </Project>